chore: add readme

Author: ClarkXia

README.md

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+<h2 align="center">A bundler based on Rspack</h2>
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+This project is under active development. It is based on Rspack, and it will add more built-in features required by ice framework.
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+## Credits
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+Thanks to the [rspack](https://github.com/web-infra-dev/rspack) project which provides the ability to customize plugins and loaders implemented by Rust.